13212378437 has 4 divisors (see below), whose sum is σ = 13224974700. Its totient is φ = 13199782176.

The previous prime is 13212378401. The next prime is 13212378449. The reversal of 13212378437 is 73487321231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6670642276 + 6541736161 = 81674^2 + 80881^2 .

It is a cyclic number.

It is not a de Polignac number, because 13212378437 - 2⁸ = 13212378181 is a prime.

It is a super-3 number, since 3×13212378437³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13212378394 and 13212378403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212348437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6296558 + ... + 6298655.

It is an arithmetic number, because the mean of its divisors is an integer number (3306243675).

Almost surely, 2^13212378437 is an apocalyptic number.

It is an amenable number.

13212378437 is a deficient number, since it is larger than the sum of its proper divisors (12596263).

13212378437 is a wasteful number, since it uses less digits than its factorization.

13212378437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12596262.

The product of its digits is 169344, while the sum is 41.

Adding to 13212378437 its reverse (73487321231), we get a palindrome (86699699668).

The spelling of 13212378437 in words is "thirteen billion, two hundred twelve million, three hundred seventy-eight thousand, four hundred thirty-seven".